Maliks Muwatta Book 16, Hadith Number 18.

Section : What to Say in the Prayer for the Dead.

Yahya related to me from Malik that Yahya ibn Said said that he heard Said ibn al-Musayyab say, “I once prayed behind Abu Hurayra over a child who had never done a wrong action and I heard him say, ‘O Allah, give him protection from the torment of the grave.'”